Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
50 - 240 ng/mL
7 - 14 days
Collect trough specimen in a green top or red top tube; do not use SST tube. Centrifuge, aliquot plasma or serum into a plastic vial and refrigerate.
Test sent to Mayo Medical Laboratories; performed by MedTox Laboratories.